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Add a basemap in D3.js
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<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="x-ua-compatible" content="ie=edge">
<title>Maps in D3js</title>
<meta name="description" content="Maps in d3js">
<meta name="author" content="Edward Mac Gillavry">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="d3js">
<link rel="shortcut icon" href="">
<style>
body {
background-color: #fffaf5;
}
svg {
background-color: #fffaf5;
}
.gemeente {
fill: #ccc;
stroke-width: 0.4;
stroke: #fff;
}
.quakes {
fill: #317581;
fill-opacity: 0.6;
stroke-width: 0.7;
stroke: #fff;
}
.induced {
fill: #EA9657;
}
.tectonic{
fill: #35495D;
}
</style>
</head>
<body>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script src="https://d3js.org/d3-tile.v0.0.min.js"></script>
<script>
let width = 450,
height = 600,
svg = d3.select("body")
.append("svg")
.attr('width', width)
.attr('height', height),
tau = 2 * Math.PI;
d3.queue()
.defer(d3.json, "gemeenten2017.topojson")
.defer(d3.json, "aardbevingen_NL.geojson")
.await(ready);
function ready(error, municipalities,earthquakes){
if (error) throw error;
let gemeenten = topojson.feature(municipalities, municipalities.objects.municipalities);
earthquakes.features.sort(function(a, b) { return b.properties.MAG - a.properties.MAG; });
let projection = d3.geoMercator()
.fitSize([width, height], gemeenten);
let path = d3.geoPath()
.projection(projection);
let tiles = d3.tile()
.size([width, height])
.scale(projection.scale() * tau)
.translate(projection([0, 0]))
();
svg.selectAll("image")
.data(tiles)
.enter().append("image")
.attr("xlink:href", function(d) { return "https://geodata.nationaalgeoregister.nl/tiles/service/wmts/brtachtergrondkaartgrijs/EPSG:3857/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
.attr("x", function(d) { return (d[0] + tiles.translate[0]) * tiles.scale; })
.attr("y", function(d) { return (d[1] + tiles.translate[1]) * tiles.scale; })
.attr("width", tiles.scale)
.attr("height", tiles.scale);
svg.append("g")
.selectAll("path")
.data(gemeenten.features)
.enter()
.append("path")
.attr("class","gemeente")
.attr("d", path)
.append("title")
.text(function(d) { return d.properties.name});
svg.selectAll(".quakes")
.data(earthquakes.features)
.enter()
.append("path")
.attr("d", path.pointRadius(function(d) {
return 2.5*Math.sqrt((Math.exp(parseFloat(d.properties.MAG))));
}))
.attr("class",function(d) {
return d.properties.TYPE == "ind" ? "quakes induced" : "quakes tectonic";
});
}
</script>
</body>
</html>
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